July 04, 2026

ISRO is developing a solid motor based Sub-Orbital Launch Vehicle for Experiments (SOLVE) as a test platform to carry out Integrated Parachute Tests for validation of deceleration system of Gaganyaan Crew Module under various test conditions. During these test missions, the Crew Module will be carried to an altitude of 10 - 17 km and separated from the vehicle. A series of 10 parachutes will be deployed to reduce the velocity of the Crew Module before splashdown in the sea.

The solid stage of SOLVE is derived from the PSLV Strap-on Motor with few modifications to meet the Gaganyaan test requirements including development of slow burn rate propellant and straight nozzle with secondary injection thrust vector control.

The first ground test of the SOLVE solid motor was carried out successfully at the Static Test Facility, Satish Dhawan Space Centre, Sriharikota. The test was successfully conducted on 03-07-2026 at 10:00hrs and the motor performance parameters are as expected. The development of SOLVE vehicle provides flexibility in conducting Gaganyaan Test Missions simulating various conditions in the actual mission.